I can't take credit for these btw, they all came with the Sears I purchased this past summer so it was the P.O.'s ingenuity to thank. I gave them a really good workout yesterday with excellent results so I thought I'd share...
These 2 are just a couple of strips of a small inner tube with bungee cord "S" hooks crimped on.


These ones are a large spring, attached in a circle, with more bungee cord hooks. I believe the rubber tubing slipped over the spring was either to enable the hooks to be moved or to prevent them from settling into the spring...perhaps a little of both.
